results of the study on reactions of halogenoximes bearing (protected) functional groups or fluorinated substituents with various phosphorus-containing dipolarophiles are described. To control the regioselectivity of the reaction, vinylphosphonates bearing a leaving group (i.e. bromine or dialkylamino group) in the α or β position were used; 3,5- and 3,4-disubstituted isoxazoles were obtained in 47–80%
描述了带有(保护的)官能团或
氟化取代基的卤代
肟与各种含
磷的双亲性试剂反应的研究结果。为了控制反应的区域选择性,使用了在α或β位置带有离去基团(即
溴或二烷基
氨基)的
乙烯基膦酸酯;3,5-和3,4-二取代
异恶唑的产率分别为47-80%和63-75%。该反应对于母体
膦酸乙烯基酯和
氰基膦酸酯也是有效的。在这种情况下,分离出相应的
异恶唑啉和
1,2,4-恶二唑衍生的
膦酸酯,产率分别为55-69%和34-73%。通过制备
磷酸组
氨酸的直接构象受限的类似物证明了所获得产物的实用性。